Release Notes for DTrace 2.0.0 1.13.2

2.0.0-1.13.2 (Nov 10th, 2023)

Thirteenth errata of the standalone userspace implementation.

This is a pre-release with limited functionality.

New features:

• DTrace can now be used for tracing with upstream kernels without requiring any additional patches, albeit with some limitations.

• The ip provider has been implemented.

• The trunc() action has been implemented.

• The pcap() action has been implemented.

• The inet_ntoa6() subroutine has been implemented.

• The inet_ntop() subroutine has been implemented.

• Support for modules.builtin.ranges data from the kernel has been added. This is the new way to determine module name association for kernel symbols that are built into the kernel. Support for kallmodsyms is retained for kernel that do not support modules.builtin.ranges yet.

• A BTF-to-CTF convertor has been added to support using DTrace with kernels that do not provide CTF data. Note that BTF is currently more limited than CTF. E.g. BTF does not provide datatype information for kernel variables.

Bugfixes:

• Struct and union member access in alloca()-allocated memory no longer cause a BPF verifier violation.

• Bitfield offset calculations have been corrected.

• Disassembler output for endianness conversion instructions has been corrected.

• Bounds checking of array datatypes of size 0 or 1 in the kernel is now skipped because they are commonly used in the kernel as anchors for dynamically sized arrays.

• Zero constants will now be checked at compile time wherever NULL pointer argument checking is done.

• Uprobes are now created using the offset in the inode rather than based on an absolute address.

• Building in various forms of kernel builds is now more streamlined.

Internal changes:

• The dependency on waitfd() has been replaced with a mechanism that does not depend on this system call.